Azure-cli: Failed to retrieve Scm Uri

[mebibou]

Describe the bug
When trying to view the logs of a function app running on python, using az webapp log tail --resource-group <group> --name <func_name>, I get the following error:

The command failed with an unexpected error. Here is the traceback:

Failed to retrieve Scm Uri
Traceback (most recent call last):
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/knack/cli.py", line 206, in invoke
    cmd_result = self.invocation.execute(args)
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/commands/__init__.py", line 351, in execute
    raise ex
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/commands/__init__.py", line 409, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/commands/__init__.py", line 402, in _run_job
    six.reraise(*sys.exc_info())
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/six.py", line 693, in reraise
    raise value
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/commands/__init__.py", line 379, in _run_job
    result = cmd_copy(params)
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/commands/__init__.py", line 171, in __call__
    return self.handler(*args, **kwargs)
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/core/__init__.py", line 451, in default_command_handler
    return op(**command_args)
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/command_modules/appservice/custom.py", line 1627, in get_streaming_log
    scm_url = _get_scm_url(cmd, resource_group_name, name, slot)
  File "/usr/local/Cellar/azure-cli/2.0.61/libexec/lib/python3.7/site-packages/azure/cli/command_modules/appservice/custom.py", line 1375, in _get_scm_url
    raise ValueError('Failed to retrieve Scm Uri')
ValueError: Failed to retrieve Scm Uri

To Reproduce
Create a python function app, publish it and try to view the logs.

Expected behavior
Logs should appear like they do for other function apps

Environment summary
Using MacOS 10.14.3, installed azure-cli using brew install azure-cli

$ az -v
azure-cli                         2.0.61

acr                                2.2.3
acs                               2.3.20
advisor                            2.0.0
ams                                0.4.3
appservice                        0.2.16
backup                             1.2.2
batch                              4.0.0
batchai                            0.4.8
billing                            0.2.1
botservice                         0.1.9
cdn                                0.2.1
cloud                              2.1.1
cognitiveservices                  0.2.5
command-modules-nspkg               2.0.2
configure                         2.0.20
consumption                        0.4.2
container                         0.3.15
core                              2.0.61
cosmosdb                           0.2.9
dla                                0.2.5
dls                                0.1.8
dms                                0.1.3
eventgrid                          0.2.2
eventhubs                          0.3.4
extension                          0.2.4
feedback                           2.1.4
find                               0.3.1
hdinsight                          0.3.2
interactive                        0.4.2
iot                                0.3.7
iotcentral                         0.1.6
keyvault                          2.2.13
kusto                              0.2.1
lab                                0.1.6
maps                               0.3.4
monitor                           0.2.11
network                            2.3.5
nspkg                              3.0.3
policyinsights                     0.1.2
profile                            2.1.4
rdbms                              0.3.9
redis                              0.4.2
relay                              0.1.4
reservations                       0.4.2
resource                          2.1.12
role                               2.4.3
search                             0.1.1
security                           0.1.1
servicebus                         0.3.4
servicefabric                     0.1.15
signalr                            1.0.0
sql                                2.2.0
sqlvm                              0.1.1
storage                            2.3.2
telemetry                          1.0.2
vm                                2.2.17

Python location '/usr/local/Cellar/azure-cli/2.0.61/libexec/bin/python'
Extensions directory '<home>/.azure/cliextensions'

Python (Darwin) 3.7.3 (default, Mar 28 2019, 11:25:53) 
[Clang 10.0.1 (clang-1001.0.46.3)]

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Additional context
I tried to connect to another function app running on node, and I got no problem. Seems to be related to reading logs from python function apps

[panchagnula]

@ahmedelnably & @ankitkumarr do you know az webapp log tail not work for Python Function apps? if this is the case we add some exception handling for this case?

[ankitkumarr]

Yes, and I think they might not work on any linux consumption apps, because there's no scm endpoint. I believe we are looking into other log streaming options. Until then, we should definitely do proper error handling. I can add that in a future sprint.